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worker.go
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worker.go
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package worker
import (
"log"
"sync"
"sync/atomic"
"time"
"github.com/nkanaev/yarr/src/storage"
)
const NUM_WORKERS = 4
type Worker struct {
db *storage.Storage
pending *int32
refresh *time.Ticker
reflock sync.Mutex
stopper chan bool
}
func NewWorker(db *storage.Storage) *Worker {
pending := int32(0)
return &Worker{db: db, pending: &pending}
}
func (w *Worker) FeedsPending() int32 {
return *w.pending
}
func (w *Worker) StartFeedCleaner() {
go w.db.DeleteOldItems()
ticker := time.NewTicker(time.Hour * 24)
go func() {
for {
<-ticker.C
w.db.DeleteOldItems()
}
}()
}
func (w *Worker) FindFavicons() {
go func() {
for _, feed := range w.db.ListFeedsMissingIcons() {
w.FindFeedFavicon(feed)
}
}()
}
func (w *Worker) FindFeedFavicon(feed storage.Feed) {
icon, err := findFavicon(feed.Link, feed.FeedLink)
if err != nil {
log.Printf("Failed to find favicon for %s (%s): %s", feed.FeedLink, feed.Link, err)
}
if icon != nil {
w.db.UpdateFeedIcon(feed.Id, icon)
}
}
func (w *Worker) SetRefreshRate(minute int64) {
if w.stopper != nil {
w.refresh.Stop()
w.refresh = nil
w.stopper <- true
w.stopper = nil
}
if minute == 0 {
return
}
w.stopper = make(chan bool)
w.refresh = time.NewTicker(time.Minute * time.Duration(minute))
go func(fire <-chan time.Time, stop <-chan bool, m int64) {
log.Printf("auto-refresh %dm: starting", m)
for {
select {
case <-fire:
log.Printf("auto-refresh %dm: firing", m)
w.RefreshFeeds()
case <-stop:
log.Printf("auto-refresh %dm: stopping", m)
return
}
}
}(w.refresh.C, w.stopper, minute)
}
func (w *Worker) RefreshFeeds() {
w.reflock.Lock()
defer w.reflock.Unlock()
if *w.pending > 0 {
log.Print("Refreshing already in progress")
return
}
feeds := w.db.ListFeeds()
if len(feeds) == 0 {
log.Print("Nothing to refresh")
return
}
log.Print("Refreshing feeds")
atomic.StoreInt32(w.pending, int32(len(feeds)))
go w.refresher(feeds)
}
func (w *Worker) refresher(feeds []storage.Feed) {
w.db.ResetFeedErrors()
srcqueue := make(chan storage.Feed, len(feeds))
dstqueue := make(chan []storage.Item)
for i := 0; i < NUM_WORKERS; i++ {
go w.worker(srcqueue, dstqueue)
}
for _, feed := range feeds {
srcqueue <- feed
}
for i := 0; i < len(feeds); i++ {
items := <-dstqueue
if len(items) > 0 {
w.db.CreateItems(items)
w.db.SetFeedSize(items[0].FeedId, len(items))
}
atomic.AddInt32(w.pending, -1)
w.db.SyncSearch()
}
close(srcqueue)
close(dstqueue)
log.Printf("Finished refreshing %d feeds", len(feeds))
}
func (w *Worker) worker(srcqueue <-chan storage.Feed, dstqueue chan<- []storage.Item) {
for feed := range srcqueue {
items, err := listItems(feed, w.db)
if err != nil {
w.db.SetFeedError(feed.Id, err)
}
dstqueue <- items
}
}